prelink_selinux(8) - Linux man page

Name

prelink_selinux - Security Enhanced Linux Policy for the prelink processes

Description

Security-Enhanced Linux secures the prelink processes via flexible mandatory access control.

The prelink processes execute with the prelink_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier.

For example:

ps -eZ | grep prelink_t

Entrypoints

The prelink_t SELinux type can be entered via the "mtrr_device_t,prelink_exec_t,unlabeled_t,proc_type,sysctl_type,filesystem_type,file_type" file types. The default entrypoint paths for the prelink_t domain are the following:"

/dev/cpu/mtrr, /usr/sbin/prelink(.bin)?, all files on the system

Process Types

SELinux defines process types (domains) for each process running on the system

You can see the context of a process using the -Z option to ps

Policy governs the access confined processes have to files. SELinux prelink policy is very flexible allowing users to setup their prelink processes in as secure a method as possible.

The following process types are defined for prelink:

prelink_cron_system_t, prelink_t

Note: semanage permissive -a prelink_t

can be used to make the process type prelink_t permissive. Permissive process types are not denied access by SELinux. AVC messages will still be generated.

File Contexts

SELinux requires files to have an extended attribute to define the file type.

You can see the context of a file using the -Z option to ls

Policy governs the access confined processes have to these files. SELinux prelink policy is very flexible allowing users to setup their prelink processes in as secure a method as possible.

The following file types are defined for prelink:

prelink_cache_t

- Set files with the prelink_cache_t type, if you want to store the files under the /var/cache directory.

prelink_cron_system_exec_t

- Set files with the prelink_cron_system_exec_t type, if you want to transition an executable to the prelink_cron_system_t domain.

prelink_exec_t

- Set files with the prelink_exec_t type, if you want to transition an executable to the prelink_t domain.

prelink_log_t

- Set files with the prelink_log_t type, if you want to treat the data as prelink log data, usually stored under the /var/log directory.

prelink_tmp_t

- Set files with the prelink_tmp_t type, if you want to store prelink temporary files in the /tmp directories.

prelink_tmpfs_t

- Set files with the prelink_tmpfs_t type, if you want to store prelink files on a tmpfs file system.

prelink_var_lib_t

- Set files with the prelink_var_lib_t type, if you want to store the prelink files under the /var/lib directory.

Note: File context can be temporarily modified with the chcon command. If you want to permanently change the file context you need to use the semanage fcontext command. This will modify the SELinux labeling database. You will need to use restorecon to apply the labels.

Managed Files

The SELinux process type prelink_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions.

file_type

all files on the system

Commands

semanage fcontext can also be used to manipulate default file context mappings.

semanage permissive can also be used to manipulate whether or not a process type is permissive.

semanage module can also be used to enable/disable/install/remove policy modules.

system-config-selinux is a GUI tool available to customize SELinux policy settings.

Author

This manual page was auto-generated using sepolicy manpage by mgrepl.